ksmbd: use memcmp() to compare ClientGUIDs (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.41 % · percentile 35 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: use memcmp() to compare ClientGUIDs ClientGUID is a fixed-size binary value and can contain embedded NUL bytes. strncmp() stops comparing at the first NUL byte, so different ClientGUID values can incorrectly be treated as equal. Use memcmp() in SMB3 multichannel session binding and FSCTL_VALIDATE_NEGOTIATE_INFO to compare all SMB2_CLIENT_GUID_SIZE bytes.
References
- https://git.kernel.org/stable/c/7bde6f181fa307d2cc1ec2b0313ac8e9811c8232
- https://git.kernel.org/stable/c/5a0367bf5ce420be7b19936def2e90adcf32a683
- https://git.kernel.org/stable/c/ba2a5b66f1d414eb8403d655f8813783892cfc85
- https://git.kernel.org/stable/c/a386c83043015a703e227775f778e40343f45911
- https://git.kernel.org/stable/c/d535363299822c5caa543787b21bd5cfa3e41949
- https://git.kernel.org/stable/c/e8bb506e6ef749ac0336f3e579d8d02396b7d832
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | Linux |
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-59714
- GCVE · GCVE-0-2026-74521
CERT-FR advisories
- CERTFR-2026-AVI-1375 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1203 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 7bde6f181fa307d2cc1ec2b0313ac8e9811c8232 ; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 5a0367bf5ce420be7b19936def2e90adcf32a683 ; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < ba2a5b66f1d414eb8403d655f8813783892cfc85 ; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < a386c83043015a703e227775f778e40343f45911 ; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < d535363299822c5caa543787b21bd5cfa3e41949 ; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < e8bb506e6ef749ac0336f3e579d8d02396b7d832 |
| Linux · Linux | affected 5.15 ; unaffected 0 < 5.15 ; unaffected 6.1.189 ≤ 6.1.* ; unaffected 6.6.158 ≤ 6.6.* ; unaffected 6.12.111 ≤ 6.12.* ; unaffected 6.18.53 ≤ 6.18.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |